mobile repairing karne ke liye hum mobile (pcb) motherboard me do tarah ki testing ko use karte hain 1-cold testing 2-hot testing to chaliye hum aapko cold testing ke bare me batate hain cold testing karne ke liye hume ek multimeter chahiye multimeter ko continuity buzzer mode par set karne ke baad multimeter ki red probe ko ground par aur black probe ko pcb ke testing points par rakhne ke baad agar ye reading milti hai jaise down side me reading milti hai to ok hai
PCB Cold Test Points With Value
loud speaker point = 250 to 600
mic tip (anolog mic) = 400 to 900
earphone connector tip = 250 to 600
sd card connector point (1.2.3.5.7.8) = 400 to 800
sd card connector point (4) = 400 to 600
sd card connector point(6 gnd) = beep sound
battery connector point (+) = 250 to 600
battery connector point (-) = 00 beep
battery connector point(bsi) = 700 to up
charging connector point(+) = 400 to 700
power on/off point (+) = 600 to 900
display connector supply point = 250 to 600
display connector signal point = 250 to 800
vibrator connector point = 250 to 700
datb rx and tx point = 600 to 700
sim card connector point(1.Vsim) = 300 to 700
sim card connector point(2.3.6)= 400 to 800
sim card connector point(4.5 gnd/nc) = beep
keypad row and colums point = 400 to 800
rtc (real time and clock) poin = 400 to 500 to friends ye hain cold testin points aur unki value by multimeter aur ab baat karte hain hot testing ki hot testing ko pcb (motherboard) me dc machine se supply dekar test karte hain isko multimeter se test karne ke liye multimeter ko 20v ac par set karke red probe ko testing points par aur black probe ko gnd se connect karne ke baad kuchh is tarah ki reading show
HOT Testing Points With Value
laud speaker point = 0 to 2.5
mic connector point = 1.8 to 3.0
earphone connector point = 0 to 2.5
sd card connector point(1.2.3.5.7.8) = 0 to2.8
sd card connector point(2.8) = 2.8
power on/off point(+) = 3.0 to 3.6
display connector supply point = 1.8 to 2.9
display connector signal point = 0 to 1.8
vibrator connector point = 1.9 to 3.6
data rx/tx point = 1.8 to 2.8
sim card connector point(Vsim)when sim in = 1.8 to 3.0
sim card connector point(2.3.6) = 0 to 2.8
keypad row and colums point = 1.8 to 2.8 to dosto ye hain hot testing ke points with value
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